# Quadratic equation/Related Articles

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*See also changes related to Quadratic equation, or pages that link to Quadratic equation or to this page or whose text contains "Quadratic equation".*

## Parent topics

- Algebra [r]: A branch of mathematics concerning the study of structure, relation and quantity.
^{[e]} - Polynomial equation [r]: An equation in which a polynomial in one or more variables is set equal to zero.
^{[e]} - Root (mathematics) [r]:
*Add brief definition or description*

## Subtopics

- Completing the square [r]: Rewriting a quadratic polynomial as a constant multiple of a linear polynomial plus a constant.
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- Factor [r]:
*Add brief definition or description* - Complex number [r]: Numbers of the form
*a+bi*, where*a*and*b*are real numbers and*i*denotes a number satisfying .^{[e]}

- Harmonic oscillator (classical) [r]: A system which, when displaced from its equilibrium position, experiences a restoring force, proportional to the displacement.
^{[e]} - Optimization (mathematics) [r]: Problem solving in which one seeks to minimize or maximize a real function by systematically choosing the values of real or integer variables from within an allowed set.
^{[e]} - Cubic equation [r]: A polynomial equation with of degree 3 (i.e.,
*x*^{3}+*px*^{2}+*qx*+r=0).^{[e]} - Green's Theorem [r]: A vector identity, equivalent to the curl theorem in two dimensions, which relates a line integral around a simple closed curve to a double integral over the enclosed plane region.
^{[e]} - Bijective function [r]: A function in which each possible output value corresponds to exactly one input value.
^{[e]} - Polar coordinates [r]: Two numbers—a distance and an angle—that specify the position of a point on a plane.
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